Paul Ryan endorses Mitt Romney

House Budget Committee Chairman Paul Ryan on Friday endorsed Mitt Romney for president, making him the latest high-profile Republican to get behind the frontrunner for the GOP nomination.

"I am convinced that Mitt Romney has the skills, the tenacity, principles, the courage and integrity to do what it takes to get America on track," Ryan said on Fox News. However, the congressman added there was more motivating his endorsement.

"I think this primary has been productive, I think it's been constructive, up 'til now," he said. But "I think we're entering a phase where it's counterproductive if it drags on much longer. We need to coalesce around Mitt Romney and focus on the task, which is defeating Barack Obama."